package operation;

import book.BookList;
import book.Book;
import java.util.Scanner;

public class DelOperation implements IOperation{
    public void work(BookList bookList) {
        System.out.println("****删除图书****");
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入您要删除的图书名: ");
        String name = scanner.nextLine();

        int currentSize = bookList.getUsedSize();
        int index = -1;
        int i = 0;
        for(i = 0;i < currentSize;i++) {
            Book book = bookList.getBook(i);
            if(book.getName().equals(name)) {
                index = i;
                break;
            }
        }
        if(i >= currentSize) {
            System.out.println("不存在该书!");
            return;
        }

        for(int j = index;j < currentSize - 1;j++) {
            Book book = bookList.getBook(j + 1);
            bookList.setBook(book,j);
        }

        bookList.setBook(null,currentSize - 1);
        bookList.setUsedSize(currentSize - 1);
        System.out.println("删除成功!");
    }
}
